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Old 11-27-2012, 09:02 PM   #1
Nov 2012
Denver, Colorado
Posts: 3

My airlock stopped two and a half days into fermentation on my first brew... does this bode unwell?

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Old 11-27-2012, 09:04 PM   #2
Post Hoc Ergo Propter Hoc
Revvy's Avatar
Dec 2007
"Detroitish" Michigan
Posts: 40,939
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It means.....your airlock stopped. Which means....


Bubbling in primary SHOULD slow or stop eventually...Bubbling stopping or slowing down doesn't mean fermentation has stopped it ONLY means bubbling has. An airlock is a VENT, a VALVE for EXCESS CO2. It's not a magic fermentation gauge. When the majority of sugars are eaten in the initial burst of fermentation, lots of co2 is released. As it slows down, bubbling ceases or stops altogether because there's not as much EXCESS Co2 being released.

But that doesn't mean fermentation is over, just that it's slowed down.

Fermentation is not always dynamic...just because you don't SEE anything happening doesn't mean that the yeast aren't happily chewing away at whatever fermentables are in there....the only way to know comes from gravity readings, and nothing else.

People who rack to a secondary too soon based on bubbling often get stuck fermentation, because they've taken the beer off the yeast while it was STILL FERMENTING.

It could just as easily be bubbling or stop bubbling for that matter, due to changes in barometric pressure, temperature, or whether or not the cat or vacuum cleaner bumped into it, as it could be to because it's still fermenting.

Activity, action, bubbles, even krausen can be affected by the envoironment just as much as it being caused by the going by that is NOT reliable.

If you want to know what's going on with your beer, then take a gravity reading. The only way to truly know what is going on in your fermenter is with your hydrometer. Like I said here in my blog, which I encourage you to read, Think evaluation before action you sure as HELL wouldn't want a doctor to start cutting on you unless he used the proper diagnostic instuments like x-rays first, right? You wouldn't want him to just take a look in your eyes briefly and say "I'm cutting into your chest first thing in the morning." You would want them to use the right diagnostic tools before the slice and dice, right? You'd cry malpractice, I would hope, if they didn't say they were sending you for an MRI and other things before going in....

Going by airlocks is the same thing. There's still things going on under the surface despite what an airlock is or isn't doing.
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Old 11-27-2012, 09:06 PM   #3
jeepinjeepin's Avatar
Apr 2011
Winston-Salem, NC
Posts: 6,411
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I bet it's fine. It is likely just finished actively fermenting. Those yeast still have work to do. Just let them be for at least another week.

Edit: dangit Revvy!
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Old 11-27-2012, 09:08 PM   #4
mcwilcr's Avatar
Oct 2010
Colorado Springs, Colorado
Posts: 887
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You're fine. airlock activity is not a good indicator if fermentation. Wait it out and take gravity readings if you have a hydrometer. if you dont, you should seriously consider buying one.

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